Tests of phenomenological collective models based on energy ratios and staggering systematics

Publisher Website
Google Scholar
Abstract
The systematics of energy ratios of successive levels of collective bands in medium and heavy mass even-even nuclei are studied. A measure of their deviation from the vibrational and rotational limiting values is found to have different magnitude and angular momentum dependence in the vibrational, gamma -unstable and rotational regions. Applications to ground state, beta , gamma , octupole and intruder bands, as well as to superbands in cases of backbending are given. In the case of superdeformed bands in the A=130 and A=150 regions the ratios get closer to the rotational limiting values with increasing spin, favouring the assumption that the nucleus tends to behave as a rigid rotor at high spin, while in rotational bands of normal deformation they get further away from the rotational limiting values with increasing spin as a result of stretching.